21357017461602 has 20 divisors (see below), whose sum is σ = 47855539127286. Its totient is φ = 7119005820480.

The previous prime is 21357017461523. The next prime is 21357017461657. The reversal of 21357017461602 is 20616471075312.

21357017461602 is a `hidden beast` number, since 2 + 1 + 3 + 570 + 1 + 74 + 6 + 1 + 6 + 0 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18173501515521 + 3183515946081 = 4263039^2 + 1784241^2 .

It is a super-2 number, since 2×21357017461602² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65916720399 + ... + 65916720722.

Almost surely, 2^{21357017461602} is an apocalyptic number.

21357017461602 is an abundant number, since it is smaller than the sum of its proper divisors (26498521665684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21357017461602 is a wasteful number, since it uses less digits than its factorization.

21357017461602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131833441135 (or 131833441126 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 21357017461602 in words is "twenty-one trillion, three hundred fifty-seven billion, seventeen million, four hundred sixty-one thousand, six hundred two".